Method for automatically controlling convexity and/or wedge of hot rolled in series type rolling machine and system thereof

Abstract

The invention relates to a method for automatically controlling the convexity and / or wedge of a hot rolled in series type rolling machine and a system (ASCC) thereof. The method comprises the following steps of: building feedback control for the bending of a working roll and the flattening of a roll gap from a first finishing mill stander to a final finishing mill stander in the hot rolled in series type rolling machine to automatically control the convexity (wedge) of strip steel, i.e. comparing the strip steel wedge which is detected by an ASCC model with the object wedge during rolling to obtain the difference; and correcting the difference through the comprehensive computation and the control method of the system to build a step type adjusting method. Therefore, the invention maximizes the response of the feedback control to correct the wedge and the convexity of the strip steel, guarantees the good flatness of products, prevents the strip steel to have snake-like motion in each stander, overcomes the defect that the existing convexity controlling method is single, and comprehensively balances the relationship between the convexity and the wedge. The invention can guarantee the convexity precision of the wedge along the long axis direction of the strip steel, improves the flatness, guarantees the product quality and the production safety, and can effectively improve the economic benefit of steel rolling factories.

Description

technical field [0001] The invention belongs to the field of automatic control, and relates to a method and a device for automatically controlling the plate convexity (wedge) of a strip steel production line, in particular to a method for dynamically controlling the flatness and convexity of the strip steel in the entire length direction during the strip steel production process A crown and / or wedge automatic control method and system for a (wedge) hot rolling tandem mill. Background technique [0002] At present, tandem finishing mills are usually used in the strip production line for rolling, but the crown control model of the common seven-stand tandem finishing mill has a single function and no automatic wedge control technology, which has many defects, such as: [0003] (1) Crown adjustment method: The crown control in the crown and shape control model mainly acts on a certain finishing mill, that is, the crown and shape control system in the secondary computer is based ...

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Problems solved by technology

[0003] (1) Crown adjustment method: The crown control in the crown and shape control model mainly acts on a certain finishing mill, that is, the crown and shape control system in the secondary computer is based on the wear, thermal expansion and actual conditions of the rolls. The rolling force calculates the roll gap crown of the stand, and compares it with the set value, and adjusts accordingly through the bending force to ensure the crown of the rolled piece, and then control the flatness. Since it only acts on one precision stand The rolling mill makes the crown control method single, and cannot effectively adjust the crown of other stands, requiring the operator to manually adjust the roll bending or fine-tune the rolling force distribution, resulting in relatively backward control methods for crown and flatness

[0004] (2) Flatness control: The ultimate goal of crown control is to obtain good flatness. At present, the flatness control of the strip steel production line only acts on the end frame (F 7 ), when receiving the plate shape data from the flatness meter, the flatness is controlled by adjusting the bending force of the end frame, but when the coiler is built, the output value of the flatness meter is not The adjustment effect is not good, and the plate shape is not ideal

[0005] (3) Wedge control technology: due to the lack of automatic wedge control technology, it is easy to cause unilateral waves and production safety problems in the strip, which cannot be improved in the existing control model

[0006] Therefore, in summary, the crown and shape control process and equipment in the prior art cannot meet the strict quality requirements of strip steel shape, and urgently need to be reformed and improved in order to meet the product quality requirements of the market

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